Table 1.

Sample Characteristics

Variable	Mean (S.D.) or percentage
Demographics
Age	32.3 ± 7.2
Education	12.0 ± 2.0
Ethnicity
Caucasian	63%
Black	27%
Hispanic	6%
Native American	4%
Married or cohabiting	11%
Employed full- or part-time	17%
In a controlled environment pretreatment	12%
Mean length of treatment (days)	36.3 ± 23.0
Substance Use History
Routes of administration used
Smoke (crack or freebase)	72%
Intranasal	54%
Inject	4%
Dollars spent on cocaine last 6 mos.	$8,481 ± 1,067
Days of cocaine use last 6 mos.	64.9 ± 40.7
Age of onset of weekly cocaine use	23.1 ± 6.5
Number of quit attempts	25.8 ± 110.0
Number of substance abuse treatment episodes	3.6 ± 4.8
Self-efficacy Measures
Self-efficacy: general rating	8.8 ± 1.9
Self-efficacy in high-risk situations	5.4 ± 1.2
Depression and Cognitive Function
Beck Depression Inventory –II	11.7 ± 6.9
Trailmaking Test- Part B (in seconds)	87.7 ± 34.8